1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * linux/drivers/acorn/net/ether1.c 4 * 5 * Copyright (C) 1996-2000 Russell King 6 * 7 * Acorn ether1 driver (82586 chip) for Acorn machines 8 * 9 * We basically keep two queues in the cards memory - one for transmit 10 * and one for receive. Each has a head and a tail. The head is where 11 * we/the chip adds packets to be transmitted/received, and the tail 12 * is where the transmitter has got to/where the receiver will stop. 13 * Both of these queues are circular, and since the chip is running 14 * all the time, we have to be careful when we modify the pointers etc 15 * so that the buffer memory contents is valid all the time. 16 * 17 * Change log: 18 * 1.00 RMK Released 19 * 1.01 RMK 19/03/1996 Transfers the last odd byte onto/off of the card now. 20 * 1.02 RMK 25/05/1997 Added code to restart RU if it goes not ready 21 * 1.03 RMK 14/09/1997 Cleaned up the handling of a reset during the TX interrupt. 22 * Should prevent lockup. 23 * 1.04 RMK 17/09/1997 Added more info when initialsation of chip goes wrong. 24 * TDR now only reports failure when chip reports non-zero 25 * TDR time-distance. 26 * 1.05 RMK 31/12/1997 Removed calls to dev_tint for 2.1 27 * 1.06 RMK 10/02/2000 Updated for 2.3.43 28 * 1.07 RMK 13/05/2000 Updated for 2.3.99-pre8 29 */ 30 31 #include <linux/module.h> 32 #include <linux/kernel.h> 33 #include <linux/types.h> 34 #include <linux/fcntl.h> 35 #include <linux/interrupt.h> 36 #include <linux/ioport.h> 37 #include <linux/in.h> 38 #include <linux/slab.h> 39 #include <linux/string.h> 40 #include <linux/errno.h> 41 #include <linux/device.h> 42 #include <linux/init.h> 43 #include <linux/netdevice.h> 44 #include <linux/etherdevice.h> 45 #include <linux/skbuff.h> 46 #include <linux/bitops.h> 47 48 #include <asm/io.h> 49 #include <asm/dma.h> 50 #include <asm/ecard.h> 51 52 #define __ETHER1_C 53 #include "ether1.h" 54 55 static unsigned int net_debug = NET_DEBUG; 56 57 #define BUFFER_SIZE 0x10000 58 #define TX_AREA_START 0x00100 59 #define TX_AREA_END 0x05000 60 #define RX_AREA_START 0x05000 61 #define RX_AREA_END 0x0fc00 62 63 static int ether1_open(struct net_device *dev); 64 static netdev_tx_t ether1_sendpacket(struct sk_buff *skb, 65 struct net_device *dev); 66 static irqreturn_t ether1_interrupt(int irq, void *dev_id); 67 static int ether1_close(struct net_device *dev); 68 static void ether1_setmulticastlist(struct net_device *dev); 69 static void ether1_timeout(struct net_device *dev, unsigned int txqueue); 70 71 /* ------------------------------------------------------------------------- */ 72 73 static char version[] = "ether1 ethernet driver (c) 2000 Russell King v1.07\n"; 74 75 #define BUS_16 16 76 #define BUS_8 8 77 78 /* ------------------------------------------------------------------------- */ 79 80 #define DISABLEIRQS 1 81 #define NORMALIRQS 0 82 83 #define ether1_readw(dev, addr, type, offset, svflgs) ether1_inw_p (dev, addr + (int)(&((type *)0)->offset), svflgs) 84 #define ether1_writew(dev, val, addr, type, offset, svflgs) ether1_outw_p (dev, val, addr + (int)(&((type *)0)->offset), svflgs) 85 86 static inline unsigned short 87 ether1_inw_p (struct net_device *dev, int addr, int svflgs) 88 { 89 unsigned long flags; 90 unsigned short ret; 91 92 if (svflgs) 93 local_irq_save (flags); 94 95 writeb(addr >> 12, REG_PAGE); 96 ret = readw(ETHER1_RAM + ((addr & 4095) << 1)); 97 if (svflgs) 98 local_irq_restore (flags); 99 return ret; 100 } 101 102 static inline void 103 ether1_outw_p (struct net_device *dev, unsigned short val, int addr, int svflgs) 104 { 105 unsigned long flags; 106 107 if (svflgs) 108 local_irq_save (flags); 109 110 writeb(addr >> 12, REG_PAGE); 111 writew(val, ETHER1_RAM + ((addr & 4095) << 1)); 112 if (svflgs) 113 local_irq_restore (flags); 114 } 115 116 /* 117 * Some inline assembler to allow fast transfers on to/off of the card. 118 * Since this driver depends on some features presented by the ARM 119 * specific architecture, and that you can't configure this driver 120 * without specifiing ARM mode, this is not a problem. 121 * 122 * This routine is essentially an optimised memcpy from the card's 123 * onboard RAM to kernel memory. 124 */ 125 static void 126 ether1_writebuffer (struct net_device *dev, void *data, unsigned int start, unsigned int length) 127 { 128 unsigned int page, thislen, offset; 129 void __iomem *addr; 130 131 offset = start & 4095; 132 page = start >> 12; 133 addr = ETHER1_RAM + (offset << 1); 134 135 if (offset + length > 4096) 136 thislen = 4096 - offset; 137 else 138 thislen = length; 139 140 do { 141 int used; 142 143 writeb(page, REG_PAGE); 144 length -= thislen; 145 146 __asm__ __volatile__( 147 "subs %3, %3, #2\n\ 148 bmi 2f\n\ 149 1: ldr %0, [%1], #2\n\ 150 mov %0, %0, lsl #16\n\ 151 orr %0, %0, %0, lsr #16\n\ 152 str %0, [%2], #4\n\ 153 subs %3, %3, #2\n\ 154 bmi 2f\n\ 155 ldr %0, [%1], #2\n\ 156 mov %0, %0, lsl #16\n\ 157 orr %0, %0, %0, lsr #16\n\ 158 str %0, [%2], #4\n\ 159 subs %3, %3, #2\n\ 160 bmi 2f\n\ 161 ldr %0, [%1], #2\n\ 162 mov %0, %0, lsl #16\n\ 163 orr %0, %0, %0, lsr #16\n\ 164 str %0, [%2], #4\n\ 165 subs %3, %3, #2\n\ 166 bmi 2f\n\ 167 ldr %0, [%1], #2\n\ 168 mov %0, %0, lsl #16\n\ 169 orr %0, %0, %0, lsr #16\n\ 170 str %0, [%2], #4\n\ 171 subs %3, %3, #2\n\ 172 bpl 1b\n\ 173 2: adds %3, %3, #1\n\ 174 ldreqb %0, [%1]\n\ 175 streqb %0, [%2]" 176 : "=&r" (used), "=&r" (data) 177 : "r" (addr), "r" (thislen), "1" (data)); 178 179 addr = ETHER1_RAM; 180 181 thislen = length; 182 if (thislen > 4096) 183 thislen = 4096; 184 page++; 185 } while (thislen); 186 } 187 188 static void 189 ether1_readbuffer (struct net_device *dev, void *data, unsigned int start, unsigned int length) 190 { 191 unsigned int page, thislen, offset; 192 void __iomem *addr; 193 194 offset = start & 4095; 195 page = start >> 12; 196 addr = ETHER1_RAM + (offset << 1); 197 198 if (offset + length > 4096) 199 thislen = 4096 - offset; 200 else 201 thislen = length; 202 203 do { 204 int used; 205 206 writeb(page, REG_PAGE); 207 length -= thislen; 208 209 __asm__ __volatile__( 210 "subs %3, %3, #2\n\ 211 bmi 2f\n\ 212 1: ldr %0, [%2], #4\n\ 213 strb %0, [%1], #1\n\ 214 mov %0, %0, lsr #8\n\ 215 strb %0, [%1], #1\n\ 216 subs %3, %3, #2\n\ 217 bmi 2f\n\ 218 ldr %0, [%2], #4\n\ 219 strb %0, [%1], #1\n\ 220 mov %0, %0, lsr #8\n\ 221 strb %0, [%1], #1\n\ 222 subs %3, %3, #2\n\ 223 bmi 2f\n\ 224 ldr %0, [%2], #4\n\ 225 strb %0, [%1], #1\n\ 226 mov %0, %0, lsr #8\n\ 227 strb %0, [%1], #1\n\ 228 subs %3, %3, #2\n\ 229 bmi 2f\n\ 230 ldr %0, [%2], #4\n\ 231 strb %0, [%1], #1\n\ 232 mov %0, %0, lsr #8\n\ 233 strb %0, [%1], #1\n\ 234 subs %3, %3, #2\n\ 235 bpl 1b\n\ 236 2: adds %3, %3, #1\n\ 237 ldreqb %0, [%2]\n\ 238 streqb %0, [%1]" 239 : "=&r" (used), "=&r" (data) 240 : "r" (addr), "r" (thislen), "1" (data)); 241 242 addr = ETHER1_RAM; 243 244 thislen = length; 245 if (thislen > 4096) 246 thislen = 4096; 247 page++; 248 } while (thislen); 249 } 250 251 static int 252 ether1_ramtest(struct net_device *dev, unsigned char byte) 253 { 254 unsigned char *buffer = kmalloc (BUFFER_SIZE, GFP_KERNEL); 255 int i, ret = BUFFER_SIZE; 256 int max_errors = 15; 257 int bad = -1; 258 int bad_start = 0; 259 260 if (!buffer) 261 return 1; 262 263 memset (buffer, byte, BUFFER_SIZE); 264 ether1_writebuffer (dev, buffer, 0, BUFFER_SIZE); 265 memset (buffer, byte ^ 0xff, BUFFER_SIZE); 266 ether1_readbuffer (dev, buffer, 0, BUFFER_SIZE); 267 268 for (i = 0; i < BUFFER_SIZE; i++) { 269 if (buffer[i] != byte) { 270 if (max_errors >= 0 && bad != buffer[i]) { 271 if (bad != -1) 272 printk ("\n"); 273 printk (KERN_CRIT "%s: RAM failed with (%02X instead of %02X) at 0x%04X", 274 dev->name, buffer[i], byte, i); 275 ret = -ENODEV; 276 max_errors --; 277 bad = buffer[i]; 278 bad_start = i; 279 } 280 } else { 281 if (bad != -1) { 282 if (bad_start == i - 1) 283 printk ("\n"); 284 else 285 printk (" - 0x%04X\n", i - 1); 286 bad = -1; 287 } 288 } 289 } 290 291 if (bad != -1) 292 printk (" - 0x%04X\n", BUFFER_SIZE); 293 kfree (buffer); 294 295 return ret; 296 } 297 298 static int 299 ether1_reset (struct net_device *dev) 300 { 301 writeb(CTRL_RST|CTRL_ACK, REG_CONTROL); 302 return BUS_16; 303 } 304 305 static int 306 ether1_init_2(struct net_device *dev) 307 { 308 int i; 309 dev->mem_start = 0; 310 311 i = ether1_ramtest (dev, 0x5a); 312 313 if (i > 0) 314 i = ether1_ramtest (dev, 0x1e); 315 316 if (i <= 0) 317 return -ENODEV; 318 319 dev->mem_end = i; 320 return 0; 321 } 322 323 /* 324 * These are the structures that are loaded into the ether RAM card to 325 * initialise the 82586 326 */ 327 328 /* at 0x0100 */ 329 #define NOP_ADDR (TX_AREA_START) 330 #define NOP_SIZE (0x06) 331 static nop_t init_nop = { 332 0, 333 CMD_NOP, 334 NOP_ADDR 335 }; 336 337 /* at 0x003a */ 338 #define TDR_ADDR (0x003a) 339 #define TDR_SIZE (0x08) 340 static tdr_t init_tdr = { 341 0, 342 CMD_TDR | CMD_INTR, 343 NOP_ADDR, 344 0 345 }; 346 347 /* at 0x002e */ 348 #define MC_ADDR (0x002e) 349 #define MC_SIZE (0x0c) 350 static mc_t init_mc = { 351 0, 352 CMD_SETMULTICAST, 353 TDR_ADDR, 354 0, 355 { { 0, } } 356 }; 357 358 /* at 0x0022 */ 359 #define SA_ADDR (0x0022) 360 #define SA_SIZE (0x0c) 361 static sa_t init_sa = { 362 0, 363 CMD_SETADDRESS, 364 MC_ADDR, 365 { 0, } 366 }; 367 368 /* at 0x0010 */ 369 #define CFG_ADDR (0x0010) 370 #define CFG_SIZE (0x12) 371 static cfg_t init_cfg = { 372 0, 373 CMD_CONFIG, 374 SA_ADDR, 375 8, 376 8, 377 CFG8_SRDY, 378 CFG9_PREAMB8 | CFG9_ADDRLENBUF | CFG9_ADDRLEN(6), 379 0, 380 0x60, 381 0, 382 CFG13_RETRY(15) | CFG13_SLOTH(2), 383 0, 384 }; 385 386 /* at 0x0000 */ 387 #define SCB_ADDR (0x0000) 388 #define SCB_SIZE (0x10) 389 static scb_t init_scb = { 390 0, 391 SCB_CMDACKRNR | SCB_CMDACKCNA | SCB_CMDACKFR | SCB_CMDACKCX, 392 CFG_ADDR, 393 RX_AREA_START, 394 0, 395 0, 396 0, 397 0 398 }; 399 400 /* at 0xffee */ 401 #define ISCP_ADDR (0xffee) 402 #define ISCP_SIZE (0x08) 403 static iscp_t init_iscp = { 404 1, 405 SCB_ADDR, 406 0x0000, 407 0x0000 408 }; 409 410 /* at 0xfff6 */ 411 #define SCP_ADDR (0xfff6) 412 #define SCP_SIZE (0x0a) 413 static scp_t init_scp = { 414 SCP_SY_16BBUS, 415 { 0, 0 }, 416 ISCP_ADDR, 417 0 418 }; 419 420 #define RFD_SIZE (0x16) 421 static rfd_t init_rfd = { 422 0, 423 0, 424 0, 425 0, 426 { 0, }, 427 { 0, }, 428 0 429 }; 430 431 #define RBD_SIZE (0x0a) 432 static rbd_t init_rbd = { 433 0, 434 0, 435 0, 436 0, 437 ETH_FRAME_LEN + 8 438 }; 439 440 #define TX_SIZE (0x08) 441 #define TBD_SIZE (0x08) 442 443 static int 444 ether1_init_for_open (struct net_device *dev) 445 { 446 int i, status, addr, next, next2; 447 int failures = 0; 448 unsigned long timeout; 449 450 writeb(CTRL_RST|CTRL_ACK, REG_CONTROL); 451 452 for (i = 0; i < 6; i++) 453 init_sa.sa_addr[i] = dev->dev_addr[i]; 454 455 /* load data structures into ether1 RAM */ 456 ether1_writebuffer (dev, &init_scp, SCP_ADDR, SCP_SIZE); 457 ether1_writebuffer (dev, &init_iscp, ISCP_ADDR, ISCP_SIZE); 458 ether1_writebuffer (dev, &init_scb, SCB_ADDR, SCB_SIZE); 459 ether1_writebuffer (dev, &init_cfg, CFG_ADDR, CFG_SIZE); 460 ether1_writebuffer (dev, &init_sa, SA_ADDR, SA_SIZE); 461 ether1_writebuffer (dev, &init_mc, MC_ADDR, MC_SIZE); 462 ether1_writebuffer (dev, &init_tdr, TDR_ADDR, TDR_SIZE); 463 ether1_writebuffer (dev, &init_nop, NOP_ADDR, NOP_SIZE); 464 465 if (ether1_readw(dev, CFG_ADDR, cfg_t, cfg_command, NORMALIRQS) != CMD_CONFIG) { 466 printk (KERN_ERR "%s: detected either RAM fault or compiler bug\n", 467 dev->name); 468 return 1; 469 } 470 471 /* 472 * setup circularly linked list of { rfd, rbd, buffer }, with 473 * all rfds circularly linked, rbds circularly linked. 474 * First rfd is linked to scp, first rbd is linked to first 475 * rfd. Last rbd has a suspend command. 476 */ 477 addr = RX_AREA_START; 478 do { 479 next = addr + RFD_SIZE + RBD_SIZE + ETH_FRAME_LEN + 10; 480 next2 = next + RFD_SIZE + RBD_SIZE + ETH_FRAME_LEN + 10; 481 482 if (next2 >= RX_AREA_END) { 483 next = RX_AREA_START; 484 init_rfd.rfd_command = RFD_CMDEL | RFD_CMDSUSPEND; 485 priv(dev)->rx_tail = addr; 486 } else 487 init_rfd.rfd_command = 0; 488 if (addr == RX_AREA_START) 489 init_rfd.rfd_rbdoffset = addr + RFD_SIZE; 490 else 491 init_rfd.rfd_rbdoffset = 0; 492 init_rfd.rfd_link = next; 493 init_rbd.rbd_link = next + RFD_SIZE; 494 init_rbd.rbd_bufl = addr + RFD_SIZE + RBD_SIZE; 495 496 ether1_writebuffer (dev, &init_rfd, addr, RFD_SIZE); 497 ether1_writebuffer (dev, &init_rbd, addr + RFD_SIZE, RBD_SIZE); 498 addr = next; 499 } while (next2 < RX_AREA_END); 500 501 priv(dev)->tx_link = NOP_ADDR; 502 priv(dev)->tx_head = NOP_ADDR + NOP_SIZE; 503 priv(dev)->tx_tail = TDR_ADDR; 504 priv(dev)->rx_head = RX_AREA_START; 505 506 /* release reset & give 586 a prod */ 507 priv(dev)->resetting = 1; 508 priv(dev)->initialising = 1; 509 writeb(CTRL_RST, REG_CONTROL); 510 writeb(0, REG_CONTROL); 511 writeb(CTRL_CA, REG_CONTROL); 512 513 /* 586 should now unset iscp.busy */ 514 timeout = jiffies + HZ/2; 515 while (ether1_readw(dev, ISCP_ADDR, iscp_t, iscp_busy, DISABLEIRQS) == 1) { 516 if (time_after(jiffies, timeout)) { 517 printk (KERN_WARNING "%s: can't initialise 82586: iscp is busy\n", dev->name); 518 return 1; 519 } 520 } 521 522 /* check status of commands that we issued */ 523 timeout += HZ/10; 524 while (((status = ether1_readw(dev, CFG_ADDR, cfg_t, cfg_status, DISABLEIRQS)) 525 & STAT_COMPLETE) == 0) { 526 if (time_after(jiffies, timeout)) 527 break; 528 } 529 530 if ((status & (STAT_COMPLETE | STAT_OK)) != (STAT_COMPLETE | STAT_OK)) { 531 printk (KERN_WARNING "%s: can't initialise 82586: config status %04X\n", dev->name, status); 532 printk (KERN_DEBUG "%s: SCB=[STS=%04X CMD=%04X CBL=%04X RFA=%04X]\n", dev->name, 533 ether1_readw(dev, SCB_ADDR, scb_t, scb_status, NORMALIRQS), 534 ether1_readw(dev, SCB_ADDR, scb_t, scb_command, NORMALIRQS), 535 ether1_readw(dev, SCB_ADDR, scb_t, scb_cbl_offset, NORMALIRQS), 536 ether1_readw(dev, SCB_ADDR, scb_t, scb_rfa_offset, NORMALIRQS)); 537 failures += 1; 538 } 539 540 timeout += HZ/10; 541 while (((status = ether1_readw(dev, SA_ADDR, sa_t, sa_status, DISABLEIRQS)) 542 & STAT_COMPLETE) == 0) { 543 if (time_after(jiffies, timeout)) 544 break; 545 } 546 547 if ((status & (STAT_COMPLETE | STAT_OK)) != (STAT_COMPLETE | STAT_OK)) { 548 printk (KERN_WARNING "%s: can't initialise 82586: set address status %04X\n", dev->name, status); 549 printk (KERN_DEBUG "%s: SCB=[STS=%04X CMD=%04X CBL=%04X RFA=%04X]\n", dev->name, 550 ether1_readw(dev, SCB_ADDR, scb_t, scb_status, NORMALIRQS), 551 ether1_readw(dev, SCB_ADDR, scb_t, scb_command, NORMALIRQS), 552 ether1_readw(dev, SCB_ADDR, scb_t, scb_cbl_offset, NORMALIRQS), 553 ether1_readw(dev, SCB_ADDR, scb_t, scb_rfa_offset, NORMALIRQS)); 554 failures += 1; 555 } 556 557 timeout += HZ/10; 558 while (((status = ether1_readw(dev, MC_ADDR, mc_t, mc_status, DISABLEIRQS)) 559 & STAT_COMPLETE) == 0) { 560 if (time_after(jiffies, timeout)) 561 break; 562 } 563 564 if ((status & (STAT_COMPLETE | STAT_OK)) != (STAT_COMPLETE | STAT_OK)) { 565 printk (KERN_WARNING "%s: can't initialise 82586: set multicast status %04X\n", dev->name, status); 566 printk (KERN_DEBUG "%s: SCB=[STS=%04X CMD=%04X CBL=%04X RFA=%04X]\n", dev->name, 567 ether1_readw(dev, SCB_ADDR, scb_t, scb_status, NORMALIRQS), 568 ether1_readw(dev, SCB_ADDR, scb_t, scb_command, NORMALIRQS), 569 ether1_readw(dev, SCB_ADDR, scb_t, scb_cbl_offset, NORMALIRQS), 570 ether1_readw(dev, SCB_ADDR, scb_t, scb_rfa_offset, NORMALIRQS)); 571 failures += 1; 572 } 573 574 timeout += HZ; 575 while (((status = ether1_readw(dev, TDR_ADDR, tdr_t, tdr_status, DISABLEIRQS)) 576 & STAT_COMPLETE) == 0) { 577 if (time_after(jiffies, timeout)) 578 break; 579 } 580 581 if ((status & (STAT_COMPLETE | STAT_OK)) != (STAT_COMPLETE | STAT_OK)) { 582 printk (KERN_WARNING "%s: can't tdr (ignored)\n", dev->name); 583 printk (KERN_DEBUG "%s: SCB=[STS=%04X CMD=%04X CBL=%04X RFA=%04X]\n", dev->name, 584 ether1_readw(dev, SCB_ADDR, scb_t, scb_status, NORMALIRQS), 585 ether1_readw(dev, SCB_ADDR, scb_t, scb_command, NORMALIRQS), 586 ether1_readw(dev, SCB_ADDR, scb_t, scb_cbl_offset, NORMALIRQS), 587 ether1_readw(dev, SCB_ADDR, scb_t, scb_rfa_offset, NORMALIRQS)); 588 } else { 589 status = ether1_readw(dev, TDR_ADDR, tdr_t, tdr_result, DISABLEIRQS); 590 if (status & TDR_XCVRPROB) 591 printk (KERN_WARNING "%s: i/f failed tdr: transceiver problem\n", dev->name); 592 else if ((status & (TDR_SHORT|TDR_OPEN)) && (status & TDR_TIME)) { 593 #ifdef FANCY 594 printk (KERN_WARNING "%s: i/f failed tdr: cable %s %d.%d us away\n", dev->name, 595 status & TDR_SHORT ? "short" : "open", (status & TDR_TIME) / 10, 596 (status & TDR_TIME) % 10); 597 #else 598 printk (KERN_WARNING "%s: i/f failed tdr: cable %s %d clks away\n", dev->name, 599 status & TDR_SHORT ? "short" : "open", (status & TDR_TIME)); 600 #endif 601 } 602 } 603 604 if (failures) 605 ether1_reset (dev); 606 return failures ? 1 : 0; 607 } 608 609 /* ------------------------------------------------------------------------- */ 610 611 static int 612 ether1_txalloc (struct net_device *dev, int size) 613 { 614 int start, tail; 615 616 size = (size + 1) & ~1; 617 tail = priv(dev)->tx_tail; 618 619 if (priv(dev)->tx_head + size > TX_AREA_END) { 620 if (tail > priv(dev)->tx_head) 621 return -1; 622 start = TX_AREA_START; 623 if (start + size > tail) 624 return -1; 625 priv(dev)->tx_head = start + size; 626 } else { 627 if (priv(dev)->tx_head < tail && (priv(dev)->tx_head + size) > tail) 628 return -1; 629 start = priv(dev)->tx_head; 630 priv(dev)->tx_head += size; 631 } 632 633 return start; 634 } 635 636 static int 637 ether1_open (struct net_device *dev) 638 { 639 if (request_irq(dev->irq, ether1_interrupt, 0, "ether1", dev)) 640 return -EAGAIN; 641 642 if (ether1_init_for_open (dev)) { 643 free_irq (dev->irq, dev); 644 return -EAGAIN; 645 } 646 647 netif_start_queue(dev); 648 649 return 0; 650 } 651 652 static void 653 ether1_timeout(struct net_device *dev, unsigned int txqueue) 654 { 655 printk(KERN_WARNING "%s: transmit timeout, network cable problem?\n", 656 dev->name); 657 printk(KERN_WARNING "%s: resetting device\n", dev->name); 658 659 ether1_reset (dev); 660 661 if (ether1_init_for_open (dev)) 662 printk (KERN_ERR "%s: unable to restart interface\n", dev->name); 663 664 dev->stats.tx_errors++; 665 netif_wake_queue(dev); 666 } 667 668 static netdev_tx_t 669 ether1_sendpacket (struct sk_buff *skb, struct net_device *dev) 670 { 671 int tmp, tst, nopaddr, txaddr, tbdaddr, dataddr; 672 unsigned long flags; 673 tx_t tx; 674 tbd_t tbd; 675 nop_t nop; 676 677 if (priv(dev)->restart) { 678 printk(KERN_WARNING "%s: resetting device\n", dev->name); 679 680 ether1_reset(dev); 681 682 if (ether1_init_for_open(dev)) 683 printk(KERN_ERR "%s: unable to restart interface\n", dev->name); 684 else 685 priv(dev)->restart = 0; 686 } 687 688 if (skb->len < ETH_ZLEN) { 689 if (skb_padto(skb, ETH_ZLEN)) 690 goto out; 691 } 692 693 /* 694 * insert packet followed by a nop 695 */ 696 txaddr = ether1_txalloc (dev, TX_SIZE); 697 tbdaddr = ether1_txalloc (dev, TBD_SIZE); 698 dataddr = ether1_txalloc (dev, skb->len); 699 nopaddr = ether1_txalloc (dev, NOP_SIZE); 700 701 tx.tx_status = 0; 702 tx.tx_command = CMD_TX | CMD_INTR; 703 tx.tx_link = nopaddr; 704 tx.tx_tbdoffset = tbdaddr; 705 tbd.tbd_opts = TBD_EOL | skb->len; 706 tbd.tbd_link = I82586_NULL; 707 tbd.tbd_bufl = dataddr; 708 tbd.tbd_bufh = 0; 709 nop.nop_status = 0; 710 nop.nop_command = CMD_NOP; 711 nop.nop_link = nopaddr; 712 713 local_irq_save(flags); 714 ether1_writebuffer (dev, &tx, txaddr, TX_SIZE); 715 ether1_writebuffer (dev, &tbd, tbdaddr, TBD_SIZE); 716 ether1_writebuffer (dev, skb->data, dataddr, skb->len); 717 ether1_writebuffer (dev, &nop, nopaddr, NOP_SIZE); 718 tmp = priv(dev)->tx_link; 719 priv(dev)->tx_link = nopaddr; 720 721 /* now reset the previous nop pointer */ 722 ether1_writew(dev, txaddr, tmp, nop_t, nop_link, NORMALIRQS); 723 724 local_irq_restore(flags); 725 726 /* handle transmit */ 727 728 /* check to see if we have room for a full sized ether frame */ 729 tmp = priv(dev)->tx_head; 730 tst = ether1_txalloc (dev, TX_SIZE + TBD_SIZE + NOP_SIZE + ETH_FRAME_LEN); 731 priv(dev)->tx_head = tmp; 732 dev_kfree_skb (skb); 733 734 if (tst == -1) 735 netif_stop_queue(dev); 736 737 out: 738 return NETDEV_TX_OK; 739 } 740 741 static void 742 ether1_xmit_done (struct net_device *dev) 743 { 744 nop_t nop; 745 int caddr, tst; 746 747 caddr = priv(dev)->tx_tail; 748 749 again: 750 ether1_readbuffer (dev, &nop, caddr, NOP_SIZE); 751 752 switch (nop.nop_command & CMD_MASK) { 753 case CMD_TDR: 754 /* special case */ 755 if (ether1_readw(dev, SCB_ADDR, scb_t, scb_cbl_offset, NORMALIRQS) 756 != (unsigned short)I82586_NULL) { 757 ether1_writew(dev, SCB_CMDCUCSTART | SCB_CMDRXSTART, SCB_ADDR, scb_t, 758 scb_command, NORMALIRQS); 759 writeb(CTRL_CA, REG_CONTROL); 760 } 761 priv(dev)->tx_tail = NOP_ADDR; 762 return; 763 764 case CMD_NOP: 765 if (nop.nop_link == caddr) { 766 if (priv(dev)->initialising == 0) 767 printk (KERN_WARNING "%s: strange command complete with no tx command!\n", dev->name); 768 else 769 priv(dev)->initialising = 0; 770 return; 771 } 772 if (caddr == nop.nop_link) 773 return; 774 caddr = nop.nop_link; 775 goto again; 776 777 case CMD_TX: 778 if (nop.nop_status & STAT_COMPLETE) 779 break; 780 printk (KERN_ERR "%s: strange command complete without completed command\n", dev->name); 781 priv(dev)->restart = 1; 782 return; 783 784 default: 785 printk (KERN_WARNING "%s: strange command %d complete! (offset %04X)", dev->name, 786 nop.nop_command & CMD_MASK, caddr); 787 priv(dev)->restart = 1; 788 return; 789 } 790 791 while (nop.nop_status & STAT_COMPLETE) { 792 if (nop.nop_status & STAT_OK) { 793 dev->stats.tx_packets++; 794 dev->stats.collisions += (nop.nop_status & STAT_COLLISIONS); 795 } else { 796 dev->stats.tx_errors++; 797 798 if (nop.nop_status & STAT_COLLAFTERTX) 799 dev->stats.collisions++; 800 if (nop.nop_status & STAT_NOCARRIER) 801 dev->stats.tx_carrier_errors++; 802 if (nop.nop_status & STAT_TXLOSTCTS) 803 printk (KERN_WARNING "%s: cts lost\n", dev->name); 804 if (nop.nop_status & STAT_TXSLOWDMA) 805 dev->stats.tx_fifo_errors++; 806 if (nop.nop_status & STAT_COLLEXCESSIVE) 807 dev->stats.collisions += 16; 808 } 809 810 if (nop.nop_link == caddr) { 811 printk (KERN_ERR "%s: tx buffer chaining error: tx command points to itself\n", dev->name); 812 break; 813 } 814 815 caddr = nop.nop_link; 816 ether1_readbuffer (dev, &nop, caddr, NOP_SIZE); 817 if ((nop.nop_command & CMD_MASK) != CMD_NOP) { 818 printk (KERN_ERR "%s: tx buffer chaining error: no nop after tx command\n", dev->name); 819 break; 820 } 821 822 if (caddr == nop.nop_link) 823 break; 824 825 caddr = nop.nop_link; 826 ether1_readbuffer (dev, &nop, caddr, NOP_SIZE); 827 if ((nop.nop_command & CMD_MASK) != CMD_TX) { 828 printk (KERN_ERR "%s: tx buffer chaining error: no tx command after nop\n", dev->name); 829 break; 830 } 831 } 832 priv(dev)->tx_tail = caddr; 833 834 caddr = priv(dev)->tx_head; 835 tst = ether1_txalloc (dev, TX_SIZE + TBD_SIZE + NOP_SIZE + ETH_FRAME_LEN); 836 priv(dev)->tx_head = caddr; 837 if (tst != -1) 838 netif_wake_queue(dev); 839 } 840 841 static void 842 ether1_recv_done (struct net_device *dev) 843 { 844 int status; 845 int nexttail, rbdaddr; 846 rbd_t rbd; 847 848 do { 849 status = ether1_readw(dev, priv(dev)->rx_head, rfd_t, rfd_status, NORMALIRQS); 850 if ((status & RFD_COMPLETE) == 0) 851 break; 852 853 rbdaddr = ether1_readw(dev, priv(dev)->rx_head, rfd_t, rfd_rbdoffset, NORMALIRQS); 854 ether1_readbuffer (dev, &rbd, rbdaddr, RBD_SIZE); 855 856 if ((rbd.rbd_status & (RBD_EOF | RBD_ACNTVALID)) == (RBD_EOF | RBD_ACNTVALID)) { 857 int length = rbd.rbd_status & RBD_ACNT; 858 struct sk_buff *skb; 859 860 length = (length + 1) & ~1; 861 skb = netdev_alloc_skb(dev, length + 2); 862 863 if (skb) { 864 skb_reserve (skb, 2); 865 866 ether1_readbuffer (dev, skb_put (skb, length), rbd.rbd_bufl, length); 867 868 skb->protocol = eth_type_trans (skb, dev); 869 netif_rx (skb); 870 dev->stats.rx_packets++; 871 } else 872 dev->stats.rx_dropped++; 873 } else { 874 printk(KERN_WARNING "%s: %s\n", dev->name, 875 (rbd.rbd_status & RBD_EOF) ? "oversized packet" : "acnt not valid"); 876 dev->stats.rx_dropped++; 877 } 878 879 nexttail = ether1_readw(dev, priv(dev)->rx_tail, rfd_t, rfd_link, NORMALIRQS); 880 /* nexttail should be rx_head */ 881 if (nexttail != priv(dev)->rx_head) 882 printk(KERN_ERR "%s: receiver buffer chaining error (%04X != %04X)\n", 883 dev->name, nexttail, priv(dev)->rx_head); 884 ether1_writew(dev, RFD_CMDEL | RFD_CMDSUSPEND, nexttail, rfd_t, rfd_command, NORMALIRQS); 885 ether1_writew(dev, 0, priv(dev)->rx_tail, rfd_t, rfd_command, NORMALIRQS); 886 ether1_writew(dev, 0, priv(dev)->rx_tail, rfd_t, rfd_status, NORMALIRQS); 887 ether1_writew(dev, 0, priv(dev)->rx_tail, rfd_t, rfd_rbdoffset, NORMALIRQS); 888 889 priv(dev)->rx_tail = nexttail; 890 priv(dev)->rx_head = ether1_readw(dev, priv(dev)->rx_head, rfd_t, rfd_link, NORMALIRQS); 891 } while (1); 892 } 893 894 static irqreturn_t 895 ether1_interrupt (int irq, void *dev_id) 896 { 897 struct net_device *dev = (struct net_device *)dev_id; 898 int status; 899 900 status = ether1_readw(dev, SCB_ADDR, scb_t, scb_status, NORMALIRQS); 901 902 if (status) { 903 ether1_writew(dev, status & (SCB_STRNR | SCB_STCNA | SCB_STFR | SCB_STCX), 904 SCB_ADDR, scb_t, scb_command, NORMALIRQS); 905 writeb(CTRL_CA | CTRL_ACK, REG_CONTROL); 906 if (status & SCB_STCX) { 907 ether1_xmit_done (dev); 908 } 909 if (status & SCB_STCNA) { 910 if (priv(dev)->resetting == 0) 911 printk (KERN_WARNING "%s: CU went not ready ???\n", dev->name); 912 else 913 priv(dev)->resetting += 1; 914 if (ether1_readw(dev, SCB_ADDR, scb_t, scb_cbl_offset, NORMALIRQS) 915 != (unsigned short)I82586_NULL) { 916 ether1_writew(dev, SCB_CMDCUCSTART, SCB_ADDR, scb_t, scb_command, NORMALIRQS); 917 writeb(CTRL_CA, REG_CONTROL); 918 } 919 if (priv(dev)->resetting == 2) 920 priv(dev)->resetting = 0; 921 } 922 if (status & SCB_STFR) { 923 ether1_recv_done (dev); 924 } 925 if (status & SCB_STRNR) { 926 if (ether1_readw(dev, SCB_ADDR, scb_t, scb_status, NORMALIRQS) & SCB_STRXSUSP) { 927 printk (KERN_WARNING "%s: RU went not ready: RU suspended\n", dev->name); 928 ether1_writew(dev, SCB_CMDRXRESUME, SCB_ADDR, scb_t, scb_command, NORMALIRQS); 929 writeb(CTRL_CA, REG_CONTROL); 930 dev->stats.rx_dropped++; /* we suspended due to lack of buffer space */ 931 } else 932 printk(KERN_WARNING "%s: RU went not ready: %04X\n", dev->name, 933 ether1_readw(dev, SCB_ADDR, scb_t, scb_status, NORMALIRQS)); 934 printk (KERN_WARNING "RU ptr = %04X\n", ether1_readw(dev, SCB_ADDR, scb_t, scb_rfa_offset, 935 NORMALIRQS)); 936 } 937 } else 938 writeb(CTRL_ACK, REG_CONTROL); 939 940 return IRQ_HANDLED; 941 } 942 943 static int 944 ether1_close (struct net_device *dev) 945 { 946 ether1_reset (dev); 947 948 free_irq(dev->irq, dev); 949 950 return 0; 951 } 952 953 /* 954 * Set or clear the multicast filter for this adaptor. 955 * num_addrs == -1 Promiscuous mode, receive all packets. 956 * num_addrs == 0 Normal mode, clear multicast list. 957 * num_addrs > 0 Multicast mode, receive normal and MC packets, and do 958 * best-effort filtering. 959 */ 960 static void 961 ether1_setmulticastlist (struct net_device *dev) 962 { 963 } 964 965 /* ------------------------------------------------------------------------- */ 966 967 static void ether1_banner(void) 968 { 969 static unsigned int version_printed = 0; 970 971 if (net_debug && version_printed++ == 0) 972 printk(KERN_INFO "%s", version); 973 } 974 975 static const struct net_device_ops ether1_netdev_ops = { 976 .ndo_open = ether1_open, 977 .ndo_stop = ether1_close, 978 .ndo_start_xmit = ether1_sendpacket, 979 .ndo_set_rx_mode = ether1_setmulticastlist, 980 .ndo_tx_timeout = ether1_timeout, 981 .ndo_validate_addr = eth_validate_addr, 982 .ndo_set_mac_address = eth_mac_addr, 983 }; 984 985 static int 986 ether1_probe(struct expansion_card *ec, const struct ecard_id *id) 987 { 988 struct net_device *dev; 989 int i, ret = 0; 990 991 ether1_banner(); 992 993 ret = ecard_request_resources(ec); 994 if (ret) 995 goto out; 996 997 dev = alloc_etherdev(sizeof(struct ether1_priv)); 998 if (!dev) { 999 ret = -ENOMEM; 1000 goto release; 1001 } 1002 1003 SET_NETDEV_DEV(dev, &ec->dev); 1004 1005 dev->irq = ec->irq; 1006 priv(dev)->base = ecardm_iomap(ec, ECARD_RES_IOCFAST, 0, 0); 1007 if (!priv(dev)->base) { 1008 ret = -ENOMEM; 1009 goto free; 1010 } 1011 1012 if ((priv(dev)->bus_type = ether1_reset(dev)) == 0) { 1013 ret = -ENODEV; 1014 goto free; 1015 } 1016 1017 for (i = 0; i < 6; i++) 1018 dev->dev_addr[i] = readb(IDPROM_ADDRESS + (i << 2)); 1019 1020 if (ether1_init_2(dev)) { 1021 ret = -ENODEV; 1022 goto free; 1023 } 1024 1025 dev->netdev_ops = ðer1_netdev_ops; 1026 dev->watchdog_timeo = 5 * HZ / 100; 1027 1028 ret = register_netdev(dev); 1029 if (ret) 1030 goto free; 1031 1032 printk(KERN_INFO "%s: ether1 in slot %d, %pM\n", 1033 dev->name, ec->slot_no, dev->dev_addr); 1034 1035 ecard_set_drvdata(ec, dev); 1036 return 0; 1037 1038 free: 1039 free_netdev(dev); 1040 release: 1041 ecard_release_resources(ec); 1042 out: 1043 return ret; 1044 } 1045 1046 static void ether1_remove(struct expansion_card *ec) 1047 { 1048 struct net_device *dev = ecard_get_drvdata(ec); 1049 1050 ecard_set_drvdata(ec, NULL); 1051 1052 unregister_netdev(dev); 1053 free_netdev(dev); 1054 ecard_release_resources(ec); 1055 } 1056 1057 static const struct ecard_id ether1_ids[] = { 1058 { MANU_ACORN, PROD_ACORN_ETHER1 }, 1059 { 0xffff, 0xffff } 1060 }; 1061 1062 static struct ecard_driver ether1_driver = { 1063 .probe = ether1_probe, 1064 .remove = ether1_remove, 1065 .id_table = ether1_ids, 1066 .drv = { 1067 .name = "ether1", 1068 }, 1069 }; 1070 1071 static int __init ether1_init(void) 1072 { 1073 return ecard_register_driver(ðer1_driver); 1074 } 1075 1076 static void __exit ether1_exit(void) 1077 { 1078 ecard_remove_driver(ðer1_driver); 1079 } 1080 1081 module_init(ether1_init); 1082 module_exit(ether1_exit); 1083 1084 MODULE_LICENSE("GPL"); 1085